A8510 Ver la hoja de datos (PDF) - Allegro MicroSystems
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A8510 Datasheet PDF : 33 Pages
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A8510
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
ELECTRICAL CHARACTERISTICS1 (continued) Valid at VIN = 16 V, TA = 25°C, indicates specifications guaranteed by design
and characterization over the full operating temperature range with TA = TJ = –40°C to 105°C; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.2
Max.
Unit
Oscillator Frequency
Oscillator Frequency
FSET/SYNC Pin Voltage
FSET Frequency Range
Synchronization
fSW
VFSET
fFSET
RFSET = 10 kΩ
RFSET = 20 kΩ
RFSET = 35.6 kΩ
RFSET = 10 kΩ
1.8
2
2.2
MHz
−
1
−
MHz
−
580
−
kHz
−
1.00
−
V
580
−
2500
kHz
Synchronized PWM Frequency
Synchronization Input
Minimum Off-Time
fSWSYNC
tPWSYNCOFF
580
−
2300
kHz
150
−
−
ns
Synchronization Input
Minimum On-Time
tPWSYNCON
150
−
−
ns
SYNC Input Logic Voltage
LED Current Sinks
VSYNC(H) FSET/SYNC pin, high level
VSYNC(L) FSET/SYNC pin, low level
−
−
0.4
V
2.0
−
−
V
LEDx Accuracy
ErrLED ISET = 120 μA
−
−
3
%
LEDx Matching
LEDx Regulation Voltage
ISET to ILEDx Current Gain
ISET Pin Voltage
Allowable ISET Current
VLED Short Detect
ΔLEDx
VLED
AISET
VISET
ISET
VLEDSC
ISET = 120 μA
VLED1 through VLED8 all equal, ISET = 120 μA
ISET = 120 μA
While LED sinks are in regulation, sensed
from LEDx pin to GND
−
−
3
%
−
680
−
mV
317
327
337
A/A
−
1.003
−
V
40
−
120
μA
4.6
−
−
V
Soft Start LEDx Current
Maximum PWM Dimming
Until Off-Time3
ILEDSS
tPWML
Current through each enabled LEDx pin
during soft start, ISET = 120 μA
Measured while EN/PWM = low, during
dimming control and internal references
are powered-on (exceeding tPWML results in
shutdown)
−
1.06
−
mA
−
32750
−
fSW
cycles
Minimum EN/PWM On-Time
EN/PWM High to LED-On Delay
tPWMH
tdPWM(on)
First cycle when powering-up device
Time between EN/PWM enable and LEDx
current reaching 90% of maximum
−
0.75
2
μs
−
0.5
1
μs
EN/PWM Low to LED-Off Delay
tdPWM(off)
Time between EN/PWM enable going low
and LEDx current reaching 10% of maximum
−
−
500
ns
VGATE Pin
VGATE Pin Sink Current
VGATE Pin Fault Shutdown
VGATE Pin Voltage
IGSINK
tGFAULT
VGS
VGS = VIN
Gate to source voltage measured when gate
is on
−
−104
−
μA
−
−
3
μs
−
–6.7
−
V
Continued on the next page…
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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